difference

...just read here and compare:

770
http://www.rolandus.com/products/productdetails.aspx?ObjectId=988

550
http://www.rolandus.com/products/productdetails.aspx?ObjectId=771

Quote about the 770:
"...the VP-550’s successor has arrived, broadening the scope of the vocal keyboardist. With the latest technology onboard, the VP-770 allows a single musician to create realistic backing parts that range from futuristic electronic vocal textures to incredible emulations of large-scale gospel choirs and beyond.

* New patches with significant improvements to the Vocal Designer®
* Enhanced expression with SuperNATURAL™-powered Brass
* High-quality headset microphone (DR-HS5 included) significantly reduces feedback
* Premium mic preamps built in"

cheers srut thanks very much for your help..

peace out bezerk..